Added task 3 (3.4 3.5 3.6).
Merge branch 'master' of https://github.com/sidorovis/cpp_craft_1013
solutions/stas_brutchikov/3/sources/3_6/binary_datafeed.cpp: fixed opening stream as binary.
Merge pull request #163 from by-stas/master

Fixed Task 3 after comments.